4,004 research outputs found

    Design and implementation of the node identity internetworking architecture

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    The Internet Protocol (IP) has been proven very flexible, being able to accommodate all kinds of link technologies and supporting a broad range of applications. The basic principles of the original Internet architecture include end-to-end addressing, global routeability and a single namespace of IP addresses that unintentionally serves both as locators and host identifiers. The commercial success and widespread use of the Internet have lead to new requirements, which include internetworking over business boundaries, mobility and multi-homing in an untrusted environment. Our approach to satisfy these new requirements is to introduce a new internetworking layer, the node identity layer. Such a layer runs on top of the different versions of IP, but could also run directly on top of other kinds of network technologies, such as MPLS and 2G/3G PDP contexts. This approach enables connectivity across different communication technologies, supports mobility, multi-homing, and security from ground up. This paper describes the Node Identity Architecture in detail and discusses the experiences from implementing and running a prototype

    Ambient networks: Bridging heterogeneous network domains

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    Providing end-to-end communication in heterogeneous internetworking environments is a challenge. Two fundamental problems are bridging between different internetworking technologies and hiding of network complexity and differences from both applications and application developers. This paper presents abstraction and naming mechanisms that address these challenges in the Ambient Networks project. Connectivity abstractions hide the differences of heterogeneous internetworking technologies and enable applications to operate across them. A common naming framework enables end-to-end communication across otherwise independent internetworks and supports advanced networking capabilities, such as indirection or delegation, through dynamic bindings between named entities

    Unified clustering and communication protocol for wireless sensor networks

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    In this paper we present an energy-efficient cross layer protocol for providing application specific reservations in wireless senor networks called the “Unified Clustering and Communication Protocol ” (UCCP). Our modular cross layered framework satisfies three wireless sensor network requirements, namely, the QoS requirement of heterogeneous applications, energy aware clustering and data forwarding by relay sensor nodes. Our unified design approach is motivated by providing an integrated and viable solution for self organization and end-to-end communication is wireless sensor networks. Dynamic QoS based reservation guarantees are provided using a reservation-based TDMA approach. Our novel energy-efficient clustering approach employs a multi-objective optimization technique based on OR (operations research) practices. We adopt a simple hierarchy in which relay nodes forward data messages from cluster head to the sink, thus eliminating the overheads needed to maintain a routing protocol. Simulation results demonstrate that UCCP provides an energy-efficient and scalable solution to meet the application specific QoS demands in resource constrained sensor nodes. Index Terms — wireless sensor networks, unified communication, optimization, clustering and quality of service

    Millimeter-wave Wireless LAN and its Extension toward 5G Heterogeneous Networks

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    Millimeter-wave (mmw) frequency bands, especially 60 GHz unlicensed band, are considered as a promising solution for gigabit short range wireless communication systems. IEEE standard 802.11ad, also known as WiGig, is standardized for the usage of the 60 GHz unlicensed band for wireless local area networks (WLANs). By using this mmw WLAN, multi-Gbps rate can be achieved to support bandwidth-intensive multimedia applications. Exhaustive search along with beamforming (BF) is usually used to overcome 60 GHz channel propagation loss and accomplish data transmissions in such mmw WLANs. Because of its short range transmission with a high susceptibility to path blocking, multiple number of mmw access points (APs) should be used to fully cover a typical target environment for future high capacity multi-Gbps WLANs. Therefore, coordination among mmw APs is highly needed to overcome packet collisions resulting from un-coordinated exhaustive search BF and to increase the total capacity of mmw WLANs. In this paper, we firstly give the current status of mmw WLANs with our developed WiGig AP prototype. Then, we highlight the great need for coordinated transmissions among mmw APs as a key enabler for future high capacity mmw WLANs. Two different types of coordinated mmw WLAN architecture are introduced. One is the distributed antenna type architecture to realize centralized coordination, while the other is an autonomous coordination with the assistance of legacy Wi-Fi signaling. Moreover, two heterogeneous network (HetNet) architectures are also introduced to efficiently extend the coordinated mmw WLANs to be used for future 5th Generation (5G) cellular networks.Comment: 18 pages, 24 figures, accepted, invited paper

    An investigation into internetworking education

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    Computer network technology and the Internet grew rapidly in recent years. Their growth created a large demand from industry for the development of IT and internetworking professionals. These professionals need to be equipped with both technical hands-on skills and non-technical or soft skills. In order to supply new professionals to the industry, educational institutions need to address these skills training in their curricula. Technical hands-on skills in internetworking education can be emphasised through the practical use of equipment in classrooms. The provision of the networking equipment to the internetworking students is a challenge. Particularly, university students in developing countries may find that this equipment is ineffectively provided by their teaching institutions, because of the expense. Modern online learning tools, such as remote access laboratories, may be used to address this need. However, the provision of such tools will also need to concentrate upon the pedagogical values. In addition, traditional remote access laboratories provide only text-based access, which was originally designed for highly professional use. Novice students may struggle with learning in these virtual environments, especially when the physical equipment is not available locally. Furthermore, non-technical skills or soft skills are social skills that should not be neglected in graduates’ future workplaces. A traditional model of developing soft skills that was used in face-to-face classroom may not be as effective when applied in an online classroom. Research on students’ opinions about their soft skills development during attending internetworking courses is needed to be conducted. In order to address both research needs, this study was focused on two research aspects related to online learning in internetworking education. The first focus was on research into providing a suitable technical learning environment to distance internetworking students. The second focus was on the students’ opinions about their non-technical skills development. To provide a close equivalent of a face-to-face internetworking learning environment to remote students in Thailand, a transformation of a local internetworking laboratory was conducted. A new multimedia online learning environment integrated pedagogically-rich tools such as state model diagrams (SMDs), a real-time video streaming of equipment and a voice communication tool. Mixed research data were gathered from remote online and local student participants. The remote online participants were invited to use the new learning environment developed in this study. Qualitative research data were collected from twelve remote online students after their trial usage. Concurrently, another set of research data were collected from local students asking their opinion about the development of soft skills in the internetworking course. There were sixty six participants in this second set of research data. Although the research data was limited, restricting the researcher’s ability to generalise, it can be concluded that the provision of multimedia tools in an online internetworking learning environment was beneficial to distant students. The superiority of the traditional physical internetworking laboratory cannot be overlooked; however, the remote laboratory could be used as a supplementary self-practice tool. A concrete learning element such as a real-time video stream and diagrams simplified students learning processes in the virtual environment. Faster communication with the remote instructors and the equipment are also critical factors for a remote access network to be successful. However, unlike the face-to-face laboratory, the future challenge of the online laboratory will creating materials which will encourage students to build soft skills in their laboratory sessions

    An extranet in action: Globally networked academics and students

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    The vexed issue of keeping staff and students up-to-date in the fast moving world of internetworking has been exercising the minds of many tertiary institutions for several years. One Australian Faculty of IT has partnered with industry in an attempt to keep the course materials up-to-date and relevant. This has led to major changes in the culture of the faculty as staff too have been trained in the certification subjects and must pass rigorous industry level examinations in order to be qualified to teach the material. This paper describes the programs and reports as well on the results of student surveys which were undertaken to see if the policy was meeting the needs of the students. The paper refers to previous staff surveys as well

    An investigation into the use of B-Nodes and state models for computer network technology and education

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    This thesis consists of a series of internationally published, peer reviewed, conference research papers and one journal paper. The papers evaluate and further develop two modelling methods for use in Information Technology (IT) design and for the educational and training needs of students within the area of computer and network technology. The IT age requires technical talent to fill positions such as network managers, web administrators, e-commerce consultants and network security experts as IT is changing rapidly, and this is placing considerable demands on higher educational institutions, both within Australia and internationally, to respond to these changes

    Compound Wired/Wireless Internetworking with OSPF

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    As wireless ad hoc networks become more deployed, there is a growing interest for compound internetworks, that is, internetworks that contain both fixed and ad hoc networks. Routing is one of the main challenges that arise in such compound internetworks. Although specialized routing protocols exist for wired and for ad-hoc networks, and several such specialized protocols could be used together in a compound internetwork, it has been shown that the use of a single routing solution in the whole internetwork brings several advantages. The IETF has standardized extensions of the Open Shortest Path First (OSPF) protocol for ad hoc operation. While previous performance evaluations of these extensions have focused on the wireless part of the internetwork and have been mostly performed by way of simulation tools, this paper studies practical issues of the use of a single protocol, extended OSPF, providing paths through a compound internetwork. In first term, it examines the behavior of OSPF in a real networking testbed. This testbed consists of an internetwork composed of 6 computers that form a static topology, \emph{i.e.}, computers do not move during network lifetime. In second term, the overall behavior of extended OSPF, both considering standard OSPF and its MANET extension, is examined. Despite the limitations of the testbed, these experiments provide both a proof-of-concept and complementary results compared to prior work in the domain, which was mostly based on simulations, and focused on wireless ad hoc network scenarios only.À mesure que les réseaux ad hoc sans fil deviennent de plus en plus déployés, il y a un intérêt croissant pour des internetworks (réseaux des réseaux) hybrides, c'est-à-dire, internetworks qui contiennent à la fois des réseaux ad hoc et des réseaux fixes. En ce domain-là, le routage est un des principaux défis qui se posent. Bien qu'il existe des protocoles de routage spécifiques pour réseaux filières et des réseaux sans fils et ad hoc, et plusieurs de ces protocoles pourraient être utilisés ensemble dans un internetwork hybride, il a été montré que l'utilisation d'une seule solution de routage dans un internetwork hybride a plusieurs avantages. L'IETF a standardisé trois extensions du protocole Open Shortest Path First (OSPF) ayant pour but le routage dans des réseaux ad hoc et à mobilité (MANETs). Les évaluations du rendement de ces extensions développées jusqu'à présent se sont concentrées sur la partie sans fil (ad hoc) de l'internetwork et ont été principalement effectuées à travers de simulations. Ce rapport étudie des questions pratiques liées a l'usage d'un seul protocol de routage, en l'occurrence OSPF, sur un internetwork hybride. D'abord, la performance de OSPF est analysée avec des experiénces sur un banc d'essai de réseaux (testbed). Ce testbed consiste en un internetwork hybride de 6 ordinateurs qui forment une topologie statique, c.-à.-d. où les ordinateurs ne bougent pas durant la vie du réseau. Deuxièmement, le comportement global du protocole OSPF étendu, à la fois sa version standard et son extension pour MANETs, est examiné. Malgré les limites du testbed, ces expériences fournissent à la fois une preuve de concept et des résultats qui confirment et complétent des travaux antérieurs dans le domaine, basés sur l'analyse du protocol sur MANETs à travers des simulations
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